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Diffuse radiation from DarkCOs with a vector-portal dark photon

Ascertain whether dark compact objects would produce detectable diffuse radiation if the dark photon couples to the Standard Model via a vector portal by computing the expected emission spectra, luminosities, and sky backgrounds and comparing them with astrophysical limits.

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Background

The paper assumes no coupling between the dark photon and the SM. If a vector-portal coupling exists, ongoing cooling of DarkCOs via dark bremsstrahlung could yield SM-visible diffuse radiation.

Establishing the observability of such signals would provide a novel avenue to test or constrain the scenario.

References

While in this work we have assumed the dark photon $\gamma_D$ has no coupling to SM particles, it will be interesting to consider whether there is detectable, diffuse radiation from these objects if $\gamma_D$ couples to the SM through, $e.g.$ a vector portal operator. We leave further investigation of these and other rich phenomena associated with DarkCOs and late-forming PBHs to future work.

— Dissipative Dark Cosmology: From Early Matter Dominance to Delayed Compact Objects (2405.04575 - Bramante et al., 7 May 2024) in Section 6 (Conclusions)